The bulk update request #11116 is pending approval.

create implication muffled_speech (572) -> muffled (4150)
create implication muffled_screaming (270) -> muffled (4150)
create implication muffled_moaning (198) -> muffled (4150)
create implication muffled_sounds (23) -> muffled (4150)
create alias muffled_scream (42) -> muffled_screaming (270)

Reason: All these categories can be gathered under "muffled".